Automapper Enum描述属性

Question

我从Enum描述属性映射有困难。我一直在寻找一个有用的例子，但运气不好。我知道还有其他一些例子，但我仍然在这个特殊的场景中挣扎。

这是我的Enum:

public enum ResolveCodeEnum
{
    [Description("Resolved - Workaround")]
    ResolvedWorkaround = 1,
    [Description("Resolved - Permanently")]
    ResolvedPermanently = 2,
    [Description("Resolved - Unknown")]
    ResolvedUnkown = 3,
    [Description("Cannot Reproduce")]
    CannotReproduce = 4,
    [Description("Invalid")]
    Invalid = 5,
    [Description("Cancelled")]
    Cancelled = 6
}

这是我的Enum Helper类:

public class EnumHelper
{
    public static string GetEnumDescription(Enum value)
    {
        FieldInfo fi = value.GetType().GetField(value.ToString());
        DescriptionAttribute[] attributes =
            (DescriptionAttribute[])fi.GetCustomAttributes(typeof(DescriptionAttribute), false);
        if (attributes != null && attributes.Length > 0)
            return attributes[0].Description;
        else
            return value.ToString();
    }
}

我的目标是通过Enum描述属性

将源映射到目的地

到目前为止，我的映射配置如下:

  Mapper.CreateMap<Result, Incident>()
            .ForMember(dest => dest.Status,
                opts => opts.MapFrom(src => src.state));

下面是缩略的Result类:

public class Result
{
    public string sys_id { get; set; }
    public string state { get; set; }
}

以下是事件类的缩写:

public class Incident
{
    public string Id{ get; set; }
    public string Status{ get; set; }
}

注意:Result类的state属性是一个字符串

例如:

我的目标是得到

 Incident.Status = "Resolved - Workaround"

从

 Result.state = "1"

我一直在努力与自动apper语法使用我的EnumHelper类

如果有人能帮我解决这个问题，我将不胜感激:)

Answer 1

有两种方法:

1. 与ResolveUsing:

   对齐

       Mapper.CreateMap<Result, Incident>()
           .ForMember(
               dest => dest.Status,
               opt => opt.ResolveUsing(src =>
               {
                   var value = (ResolveCodeEnum)Enum.Parse(
                                   typeof(ResolveCodeEnum), src.state);
                   return EnumHelper.GetEnumDescription(value);
               }));
   

2. 自定义ValueResolver:

   public class EnumValueResolver : ValueResolver<Result, string>
   {
       protected override string ResolveCore(Result src)
       {
           var value = (ResolveCodeEnum)Enum.Parse(typeof(ResolveCodeEnum), src.state);
           return EnumHelper.GetEnumDescription(value);    
       }
   }
   

   用法:

   Mapper.CreateMap<Result, Incident>()
       .ForMember(
           dest => dest.Status,
           opt => opt.ResolveUsing<EnumValueResolver>());
   

我推荐#2，因为它更干净。